Tax credits have been extended through 2011 to encourage energy-efficient home improvements. Window or door replacement with Marvin products may qualify for this tax credit. The incentive has been reduced to the pre-Economic Recovery Act level. Consumers can claim a credit of 10% up to $200 of the purchase price of qualifying windows, and 10% up to $500 for qualifying exterior doors. Installation costs are not included.

There is now a lifetime limit of $500 ($200 for windows) in total credits that a homeowner can claim from January 1, 2006 to December 31, 2011, excluding the $1,500 limit in 2009-2010. If a homeowner has already reached or exceeded the $500 limit, they are no longer eligible to claim the credit in 2011.

The $500 aggregate lifetime limit is for any combination of all tax credit qualifying products (HVAC, insulation, roofing, etc), not just windows and exterior doors. If you have claimed less than $500, you can claim the difference up to the $200 cap for the windows, and $500 for the exterior doors. Eligible windows and doors need to be ENERGY STAR-qualified products.